(19)

(11)

EP 2 961 916 A1

(12)

(43) Date of publication: 06.01.2016 Bulletin 2016/01 (21) Application number: 13714017.4 (22) Date of filing: 01.03.2013

(51) International Patent Classification (IPC):  E21B 23/00(2006.01) E21B 34/08(2006.01) E21B 23/08(2006.01) E21B 37/00(2006.01) (86) International application number: PCT/NO2013/050043 (87) International publication number: WO 2014/133393 (04.09.2014 Gazette 2014/36)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME (71) Applicant: Archer Oil Tools AS 4033 Stavanger (NO)	(72) Inventor: SKJEIE, Trond N-4885 Hundvåg (NO) (74) Representative: Fluges patent as  Pb. 27 1629 Gamle Fredrikstad 1629 Gamle Fredrikstad (NO)